Changjiang vs Chang

Changjiang and Chang both are nouns.

Word	Noun	Adjective	Verb	Adverb
Changjiang	Yes	No	No	No
Chang	Yes	No	No	No

As nouns, Changjiang and Chang are synonyms defined as:

Changjiang and Chang: the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai

Other synonyms of Changjiang include Chang Jiang, Yangtze, Yangtze Kiang, Yangtze River.

Changjiang (noun)	Chang (noun)
the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai	the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai